Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cac thuc » cach thuc, cac thu, can thuc
va thanh » gia thanh, va tinh, le thanh
so sach » bo sach, co sach, hoc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) y nang xa hoi. hieu va cac thuc ((va thanh) OR (ban thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y nang xa hoi. hieu va cac thuc ((va thanh) OR (ban thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) y nang xa hoi. hieu va cac thuc ((va thanh) OR (ban thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) y nang xa hoi. hieu va cac thuc ((va thanh) OR (ban thanh)) vi cua tre*.